No, your ok
If you think a treatment plant is unpleasant to work on, try changing the pump in a raw sewage holding tank / pumping system (to pump sewage up to a higher level to join the main sewer)
Smelt a black water system on a ship once, the Island Escape ( Booz cruiser ), when the chief engineer decided to shear a main gate valve adjacent to the lift shaft ( on the first day of taking passengers on in Palma Nova ). Just had to run as my lungs simply refused to draw a breath in, like chemical warfare :-/.
CE was wearing white overalls, I bet Vanish couldn't get those stains out